K850i camera button problem

Hello everyone,

I've bought a second hand k850i, which camera button doesn't work...
When I opened the case to see if I can fix it by myself, under the button I saw only one tiny metal plate with a hole in the center, that fit exactly in that location.
The problem is that the camera button is hard ... it didn't have these two grades for autofocus and snapshoting... in the service menu when I press that button the phone doesn't read it as command (as I did not pressing it)

So my conclusion is that the previous owner is disassembled it and lost some important part(s), but I don't know which exactly... Can you help me with photos or spare part numbers so I can buy them form the local SE service office and fix it?

The phone has a guarantee, but I don't want to give my phone to them, because they will conclude like me. That phone has been opened and over warranty is over! :(

Please, help!

Thanks in advance! :wink:

EDIT: Actually I don't have that button...
http://www.esato.com/board/img.php?id=107265

Only the right one is in place (that for on/off camera).

Is that soldered or I have to put it down only?